EP0655735A1 - Signalwiedergabegerät - Google Patents

Signalwiedergabegerät Download PDF

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Publication number
EP0655735A1
EP0655735A1 EP19940118007 EP94118007A EP0655735A1 EP 0655735 A1 EP0655735 A1 EP 0655735A1 EP 19940118007 EP19940118007 EP 19940118007 EP 94118007 A EP94118007 A EP 94118007A EP 0655735 A1 EP0655735 A1 EP 0655735A1
Authority
EP
European Patent Office
Prior art keywords
signal
tracks
information
reproducing head
reproducing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19940118007
Other languages
English (en)
French (fr)
Other versions
EP0655735B1 (de
Inventor
Shuya C/O Canon Kabushiki Kaisha Tanaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
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Filing date
Publication date
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Publication of EP0655735A1 publication Critical patent/EP0655735A1/de
Application granted granted Critical
Publication of EP0655735B1 publication Critical patent/EP0655735B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/20—Moving record carrier backwards or forwards by finite amounts, i.e. backspacing, forward spacing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B15/05—Control of operating function, e.g. switching from recording to reproducing by sensing features present on or derived from record carrier or container
    • G11B15/087—Control of operating function, e.g. switching from recording to reproducing by sensing features present on or derived from record carrier or container by sensing recorded signals
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/1808—Driving of both record carrier and head
    • G11B15/1816—Programmed access in sequence to indexed parts of operating tapes cooperating with rotating heads
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/46—Controlling, regulating, or indicating speed
    • G11B15/463—Controlling, regulating, or indicating speed by using pilot tracking tones embedded in binary coded signals, e.g. using DSV/CDS values of coded signals
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/46—Controlling, regulating, or indicating speed
    • G11B15/467—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven
    • G11B15/4673—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven by controlling the speed of the tape while the head is rotating
    • G11B15/4675—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven by controlling the speed of the tape while the head is rotating with provision for information tracking
    • G11B15/4676—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven by controlling the speed of the tape while the head is rotating with provision for information tracking using signals recorded in tracks disposed in parallel with the scanning direction
    • G11B15/4677—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven by controlling the speed of the tape while the head is rotating with provision for information tracking using signals recorded in tracks disposed in parallel with the scanning direction using auxiliary signals, i.e. pilot signals
    • G11B15/4678—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven by controlling the speed of the tape while the head is rotating with provision for information tracking using signals recorded in tracks disposed in parallel with the scanning direction using auxiliary signals, i.e. pilot signals superimposed on the main signal track
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00—Head arrangements not specific to the method of recording or reproducing
    • G11B21/02—Driving or moving of heads
    • G11B21/08—Track changing or selecting during transducing operation
    • G11B21/081—Access to indexed tracks or parts of continuous track
    • G11B21/086—Access to indexed tracks or parts of continuous track on tapes
    • G11B21/088—Access to indexed tracks or parts of continuous track on tapes with track following of accessed part
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
    • G11B27/30—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording
    • G11B27/3027—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording used signal is digitally coded
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B5/584—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on tapes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/40—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using video transcoding, i.e. partial or full decoding of a coded input stream followed by re-encoding of the decoded output stream
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
    • H04N19/51—Motion estimation or motion compensation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/78—Television signal recording using magnetic recording
    • H04N5/782—Television signal recording using magnetic recording on tape
    • H04N5/7824—Television signal recording using magnetic recording on tape with rotating magnetic heads
    • H04N5/7826—Television signal recording using magnetic recording on tape with rotating magnetic heads involving helical scanning of the magnetic tape
    • H04N5/78263—Television signal recording using magnetic recording on tape with rotating magnetic heads involving helical scanning of the magnetic tape for recording on tracks inclined relative to the direction of movement of the tape
    • H04N5/78266—Television signal recording using magnetic recording on tape with rotating magnetic heads involving helical scanning of the magnetic tape for recording on tracks inclined relative to the direction of movement of the tape using more than one track for the recording of one television field or frame, i.e. segmented recording
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/1808—Driving of both record carrier and head
    • G11B15/1875—Driving of both record carrier and head adaptations for special effects or editing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/46—Controlling, regulating, or indicating speed
    • G11B15/52—Controlling, regulating, or indicating speed by using signals recorded on, or derived from, record carrier
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/78—Television signal recording using magnetic recording
    • H04N5/782—Television signal recording using magnetic recording on tape
    • H04N5/783—Adaptations for reproducing at a rate different from the recording rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/797—Processing of colour television signals in connection with recording for recording the signal in a plurality of channels, the bandwidth of each channel being less than the bandwidth of the signal
    • H04N9/7973—Processing of colour television signals in connection with recording for recording the signal in a plurality of channels, the bandwidth of each channel being less than the bandwidth of the signal by dividing the luminance or colour component signal samples or frequency bands among a plurality of recording channels

Definitions

  • the present invention relates to an apparatus for reproducing a signal from a number of tracks formed on a recording medium and, more particularly, to tracking control for use in the apparatus
  • reproduction tracking systems for domestic-use video tape recorders (VTRs) have heretofore been proposed and put into practice.
  • One type of reproduction tracking system is a dedicated control track system (CTL system) which is arranged to record a vertical synchronizing signal separated from a recorded signal on a tape in the longitudinal direction thereof by means of a fixed, magnetic head which is provided at a location on a tape path.
  • CTL system dedicated control track system
  • the other type of reproduction tracking system is a system (4fATF system) in which four kinds of pilot signals having different, comparatively low frequencies are cyclically recorded in a multiplexed manner on a track on which a main signal is recorded.
  • ATF error signal tracking error signal
  • the CTL system is disadvantageous to a reduction in the size of the entire assembly since a space for the fixed head is needed.
  • the 4fATF system is advantageous to a reduction in the size of the entire assembly, but the four kinds of pilot signals are needed.
  • VTRs which are arranged to record an image signal for one field on a plurality of tracks in divided form have been developed so that a comparatively large amount of information can be recorded or reproduced, and tracking systems for use in such VTRs have been considered.
  • pilot signals are multiplexed on the video signal every other track. More specifically, two kinds of pilot signals f1 and f2 having different frequencies are alternately recorded in units of one track; that is to say, each of the pilot signals f1 and f2 is multiplexed periodically at intervals of four tracks.
  • a tracking error signal (ATF error signal) is obtained from the result of this comparison.
  • pilot signals may be multiplexed in such a way that an analog pilot signal is simply multiplexed onto a digital video signal.
  • the method of controlling modulation to add a pilot signal as a frequency component of a digital modulated signal has been proposed.
  • the above brief description has been made in connection with the arrangement of the VTR system and the tracking system on both of which preferred embodiments of the present invention to be described later are based.
  • the present tracking system is hereinafter referred to as the "2fATF system"
  • a pilot-signal generating rotation and the recording or reproduction of frames are synchronized with each other in units of two frames (twenty tracks) in the case of a VTR which is arranged to record one frame on ten tracks.
  • One approach to the tracking deviation is to execute recording by necessarily starting a recording from an odd frame and completing the recording on an even frame and to execute reproduction by necessarily starting a reproduction from an odd frame and completing the reproduction on an even frame.
  • this approach is not practical, since all operating modes, such as recording and reproduction, must be performed in units of two frames.
  • Another object of the present invention is to provide a signal reproducing apparatus capable of accomplishing tracking control quickly after the start of reproduction.
  • a reproducing apparatus arranged to reproduce an information signal from a recording medium on which a number of recording tracks are formed in parallel with each other and the information signal is recorded on the recording tracks together with track number information indicative of numbers of the respective recording tracks, a pilot signal component being multiplexed onto the information signal periodically at intervals of a predetermined number of tracks.
  • the reproducing apparatus comprises a reproducing head, tracking control means for executing tracking control of the reproducing head with respect to a target track, by using the pilot signal component contained in a signal reproduced by the reproducing head, and determining means for determining the target track according to the track number information separated from the signal reproduced by the reproducing head.
  • FIG. 1(a) is a schematic, top plan view of a drum for a VTR to which the present invention is applied.
  • a rotary drum 300 includes a head (ch1) 302 having a plus (+) azimuth and corresponding to a channel 1, a head (ch2) 303 having a minus (-) azimuth and corresponding to a channel 2, a head (ch3) 304 having a plus (+) azimuth and corresponding to a channel 3, and a head (ch4) 305 having a minus (-) azimuth and corresponding to a channel 4.
  • Reference numeral 301 denotes a tape.
  • Fig. 1(b) is a schematic view showing the heights of the respective heads ch1, ch2, ch3 and ch4 as viewed from the front side of the rotary drum 300 during the rotation thereof.
  • the heads ch1 and ch2 as well as ch3 and ch4 are disposed in pairs in close proximity to each other. Each of the pairs is spaced 180° apart from the other and, as can be seen from Fig. 1(b), the heads ch2 and ch4 are offset from the heads ch1 and ch3 by a distance h which approximately corresponds to a one-track pitch.
  • Fig. 2 is a view showing a recording pattern.
  • Two kinds of pilot signals f1 and f2 are used for providing a tracking error signal, and are recorded in such a manner as to be multiplexed onto a main signal in alternate sequence and every other track.
  • a drum rotation for four tracks constitutes the pilot-signal generating rotation required to generate the pilot signals f1 and f2.
  • Neither of the pilot signals f1 and f2 is multiplexed onto any of the tracks formed by the heads ch1 and ch3 of plus (+) azimuth, whereas the pilot signals f1 and f2 are alternately multiplexed onto the tracks formed by the heads ch2 and ch4 of minus (-) azimuth.
  • Fig. 3 is a block diagram of the essential portion of the reproducing circuit used in the 2fATF-system 4-head VTR to which the embodiment of the present invention is applied.
  • the shown reproducing circuit includes a switching circuit 100 for selecting either one of the reproduced signal outputs of the heads ch1 and ch3, a band-pass filter 101 (BPF1) for extracting a frequency band which contains the pilot signals f1 and f2 from the reproduced signal output selected by the switching circuit 100, an amplifier 102 for amplifying the reproduced pilot signals f1 and f2 outputted from the band-pass filter 101 (BPF1), a band-pass filter 103 (BPF2) for extracting only the frequency component of the pilot signal f2 from the output of the amplifier 102, a band-pass filter 104 (BPF3) for extracting only the frequency component of the pilot signal f1 from the output of the amplifier 102, a detecting circuit 105 for converting the frequency component of the pilot signal f2 outputted from the band-pass filter 103 (
  • the drum rotation detection signal (drum PG) 111 is obtained by the rotation of the rotary drum 300 being detected by a drum PG detecting part DP.
  • the head switching signal 112 serves to switch the reproduced signal outputs of the heads ch1 and ch3 in synchronism with the rotation of the rotary drum 300.
  • the ATF selecting signal 113 serves to switch the output of the differential amplifier circuit 107 and the output of the inverting amplifier 108.
  • the shown reproducing circuit also includes a digital demodulating part 114 for demodulating the main signal contained in the selected signal outputted from the switching circuit 100 into digital data, an identification data (ID) detecting part 115 for detecting identification data (ID) which contains the intraframe track information 116 multiplexed as digital data, from the demodulated digital data provided by the digital demodulating part 114, and a video/audio signal reproduction processing circuit 117 for demodulating a video signal and an audio signal, which constitute the main signal, from the demodulated digital data.
  • the video/audio signal reproduction processing circuit 117 outputs the demodulated video and audio signals as a reproduced video signal 118 and a reproduced audio signal 119.
  • An ATF error signal 120 serves to control the rotational speed of a capstan CP for transporting a tape in the longitudinal direction thereof.
  • Fig. 4 is a timing chart showing the timing waveforms obtained when the respective signals used in the embodiment shown in Fig. 3 are reproduced in a normal reproduction mode.
  • Part (a) of Fig. 4 shows the intraframe track information 116 obtained when reproduction is started from an odd frame, i.e, information indicative of the track number of a track from which a recorded signal is currently being reproduced.
  • Part (b) of Fig. 4 shows the timing of the reproduced pilot signals f1 and f2 which are obtained when reproduction is started from the odd frame.
  • Part (c) of Fig. 4 shows the ATF selecting signal 113 which is obtained during that time.
  • Part (d) of Fig. 4 is an ATF logic which is obtained during that time.
  • FIG. 4 shows the intraframe track information 116 obtained when reproduction is started from an even frame, i.e, information indicative of the track number of a track from which a recorded signal is currently being reproduced.
  • Part (f) of Fig. 4 shows the timing of the reproduced pilot signals f1 and f2 which are obtained when reproduction is started from the even frame.
  • Part (g) of Fig. 4 shows the ATF selecting signal 113 which is obtained during that time.
  • Part (h) of Fig. 4 is an ATF logic which is obtained during that time.
  • the pilot signals f1 and f2 from which to obtain the ATF error signal are contained in a signal reproduced by each of the (+) azimuth heads ch1 and ch3, in the form of crosstalk components derived from both adjacent tracks ((-) azimuth tracks). Accordingly, to obtain the ATF error signal, the reproducing circuit according to the present embodiment needs only the reproduced signals outputted from the heads ch1 and ch3.
  • the switching circuit 100 alternately selects one of the reproduced signals outputted from the heads ch1 and ch3 and outputs a serial reproduced signal. Since this reproduced signal contains a main signal, the reproduced signal is conducted to the video/audio signal reproduction processing circuit 117 through the digital demodulating part 114 and the ID detecting part 115.
  • the reproduced signal outputted from the switching circuit 100 is also conducted to the band-pass filter 101 (BPF1) to extract the reproduced pilot signals f1 and f2 for an ATF circuit.
  • the pilot signals f1 and f2 which are respectively contained as crosstalk components are separated and detected from the reproduced signal by the respective band-pass filters 104 (BPF3) and 103 (BPF2), and are then compared by the differential amplifier circuit 107.
  • the differential amplifier circuit 107 outputs one tracking signal.
  • the intraframe track information 116 detected by the ID detecting part 115 is sent to the control microcomputer 110, and the control microcomputer 110 generates the ATF selecting signal 113 synchronized with the head switching signal (HSW) 112, according to whether reproduction has been started from the first track contained in an odd frame or the eleventh track contained in an even frame.
  • the positional order of the tracks on which the pilot signals f1 and f2 are respectively recorded is reversed between the start of reproduction from the odd frame and the start of reproduction from the even frame.
  • the switching circuit 109 selects in synchronism with the ATF selecting signal 113 the output of the inverting amplifier 108 which has received the tracking signal outputted from the differential amplifier circuit 107.
  • the switching circuit 109 selects the output of the inverting amplifier 108 in synchronism with the ATF selecting signal 113.
  • the tracking signal outputted from the differential amplifier circuit 107 is formed into the ATF error signal 120 by the switching circuit 109.
  • the 2fATF system is arranged in such a manner that a positive logic or a negative logic for the ATF error signal is selected according to the intraframe track information, in view of the fact that the positional order of the tracks on which the pilot signals f1 and f2 are respectively recorded is reversed between the odd frame and the even frame. Accordingly, it is possible to quickly execute tracking control even in the case of the VTR in which the pilot-signal generating rotation and the recording or reproduction of frames are synchronized with each other in units of two frames. It is, therefore, possible to shift an operating mode in units of one frame.
  • the selection between the positive and negative logics for the ATF signal substantially means that either one of two tracks which are spaced two tracks apart from each other is selected as a target track to be subjected to tracking control.
  • FIG. 6 the elements 100 to 120 are identical to the corresponding ones shown in Fig. 3.
  • reference numeral 801 denotes a capstan FG signal indicative of the amount of travel of the tape obtained by detecting a rotation of the capstan CP by means of a capstan FG detecting part CF.
  • an ATF selecting signal 113 based on a predication about the timing at which the corresponding head traverses a track during head tracing is generated on the basis of the intraframe track information 116 and the capstan FG signal 801. Accordingly, it is possible to always select a correct logic for the ATF error signal even during the triple-speed search reproduction mode, so that it is possible to effect correct tracking control.
  • the present invention is not limited to this type of VTR.
  • the present invention can be applied to a general VTR in which two heads are spaced 180° apart from each other and which adopts a tracking error detecting system arranged not to multiplex a pilot signal on a main signal periodically at intervals of two tracks.
  • the intraframe track information used in each of the embodiments is numerical information indicative of particular numbers of from “1” to "20", the present invention is not limited to this type of information.
  • the present invention can be applied to any type of track information that makes it possible to detect a pilot-signal generating rotation.
  • the arrangement is adopted in which a logic for an ATF error signal is selected on the basis of the output signal of track information detecting means. Accordingly, even in an ATF system in which a pilot signal is multiplexed every other track so that the pilot-signal generating rotation and the recording or reproduction of frames are synchronized with each other in units of two frames, a logic for the ATF error signal can be selected at the same time that the first track in one frame is traced, so that correct tracking control can be effected over the subsequent tracks within the frame. Accordingly, it is possible to shift the operating mode in units of one frame.
  • a reproducing apparatus arranged to reproduce an information signal from a recording medium on which a number of recording tracks are formed in parallel with each other and the information signal is recorded on the recording tracks together with track number information indicative of numbers of the respective tracks, a pilot signal component being multiplexed onto the information signal periodically at intervals of a predetermined number of tracks.
  • the reproducing apparatus executes tracking control of the reproducing head with respect to a target track, by using the pilot signal component contained in a signal reproduced by a reproducing head.
  • the reproducing apparatus determines the target track according to the track number information separated from the signal reproduced by the reproducing head. According to the above-described arrangement, it is possible to execute correct tracking control quickly after the start of reproduction.
  • the track number information recorded on the recording medium in a multiplexed manner is effectively utilized, it is not necessary to provide a special circuit for determining the target track.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
EP19940118007 1993-11-16 1994-11-15 Signalwiedergabegerät Expired - Lifetime EP0655735B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP28687893A JPH07141725A (ja) 1993-11-16 1993-11-16 信号記録再生装置
JP286878/93 1993-11-16
JP28687893 1993-11-16

Publications (2)

Publication Number Publication Date
EP0655735A1 true EP0655735A1 (de) 1995-05-31
EP0655735B1 EP0655735B1 (de) 2000-08-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940118007 Expired - Lifetime EP0655735B1 (de) 1993-11-16 1994-11-15 Signalwiedergabegerät

Country Status (5)

Country Link
US (1) US6134074A (de)
EP (1) EP0655735B1 (de)
JP (1) JPH07141725A (de)
CN (1) CN1090424C (de)
DE (1) DE69425415T2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7379261B2 (en) 2003-04-04 2008-05-27 Sony Corporation Apparatus and method for reproducing recorded signal

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200485538Y1 (ko) * 2016-02-22 2018-01-23 한윤석 청량음료용 컵 구조체

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4803570A (en) * 1985-08-06 1989-02-07 Canon Kabushiki Kaisha Rotary head type multichannel information signal reproducing apparatus having sub-information search function
EP0343726A1 (de) * 1988-05-27 1989-11-29 Koninklijke Philips Electronics N.V. Anordnung zum Aufnehmen oder Wiedergeben eines elektrischen Signals
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EP0560596A2 (de) * 1992-03-10 1993-09-15 Sharp Kabushiki Kaisha Verbessertes magnetisches Wiedergabe-/Aufnahmegerät mit einem Segmentaufzeichnungssystem
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Also Published As

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US6134074A (en) 2000-10-17
JPH07141725A (ja) 1995-06-02
DE69425415T2 (de) 2001-02-08
DE69425415D1 (de) 2000-09-07
EP0655735B1 (de) 2000-08-02
CN1115543A (zh) 1996-01-24
CN1090424C (zh) 2002-09-04

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